The Habitrail OVO Adventure Pack is the perfect addition for your pet to take his explorations to new heights! The Habitrail OVO Adventure Pack is customizable to how you want to build it, and lets your hamster roam to different hideaways. Your hamster can choose to go for a snooze in his den, or burrow his way up to the transport unit and then jet back down for a quick snack back in his pad. The retractable roof at the top allows you easy access to your pet, and the clear plastic allows you to view your pet at all times. The Habitrail OVO Adventure Pack is the perfect way to expand your pet's home.